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First, it was actually R.Pattz who brought the Twilight twosome into Katy Perry's fold—Rob and Katy share a mutual friend in actress Shannon Woodward. That said, Kristen is still scoring plenty of face time with the sexy songstress lately.

Like when the two hit up a concert taping for the 3-D flick Katy Perry:Part of Me. And now the trio are partying together at the swanky Chateau Marmont, where Katy hung out after attending the Kids Choice Awards and before jetting off to India.

After spending Friday night taking in a show at Hotel Café, Rob and Kristen hit up the Chateau on Saturday night, arriving at the exclusive Hollywood hot spot around 11:30 p.m. and immediately making their way over to Katy, who was holding court on the patio.

"They are obviously very close to Katy," an insider reveals to E! News about the new A-list friends. "She was very happy having her girls' night out, but when Rob and Kristen arrived she was really pleased to see them. The group seemed to be having lots of fun together. They were laughing a lot and were really enjoying themselves."

Apparently so! Because the gang—shall we call them Robstenerry?—have made no secret of their recent friendship, with Kristen even complimenting Katy while accepting her Kids' Choice Awards: "I just have to say, Katy Perry's armor was the coolest thing I've ever seen."

Hey, now that we know they're practically BFF, maybe Katy's Snow White and the Huntsman-esque costume was inspired by Kristen. Ya never know, right?!

Not very. An onlooker continues: "Rob and Kristen weren't overly affectionate in any way; they were not holding hands, but they stayed by one another's side all night. It was obviously a very low-key night for them as they were not dressed up at all."

Rob—who has been rocking a full beard lately (just peep those paddle-boarding pics)—wore a black baseball cap while Kristen donned a black hoodie. We're told they seemed determined to stay undercover and not draw attention to themselves.

Psh, like that ever happens! Now whoever said three is a crowd, because we are loving these Rob, Kristen and Katy date nights!

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Your information may be shared with other NBCUniversal businesses and used to better tailor our services and advertising to you. For more details about how we use your information, see our Privacy Policy. If you are located outside of the U.S., your information may be transferred to, processed and used in the U.S.